Sunday, Dec 25, 2011 - 4:00 AMSt. Olaf College in Minnesota celebrates 100 years of its Christmas Festival, which began as a small campus event and now has a worldwide audience. Five choral ensembles and the St. Olaf Orchestra - more than 500 student musicians strong - perform a rich repertoire of Christmas compositions, familiar carols and hymns from around the world. This year's performance also debuts newly commissioned works by American composers Andr? J. Thomas and David N. Childs.G